G1 is the cell growth phase where the cell accumulates nutrients and decide if it is going to undergo the cell cycle, as determined by the restriction point in G1. If the cell has insufficient nutrients or has not grown sufficiently to enter the cell cycle, it will remain in G1 or exit to G0 phase where it will not divide.
G2 occurs after S phase DNA replication in the cell cycle. In G2, the cell is growing and preparing for cell cycle by producing proteins required such as the centrosome.
Please do verify my answers with online sources. Thanks!
<span>The
answer is facilitated diffusion. It requires no energy because the ions are
traveling down the concentration
gradient. Facilitated diffusion is important
for the regulation of ions in a cell. It also enables
ions to pass across the hydrophobic layer of the cell membrane composed
of phospholipids.</span>
Its' A, I believe.
Hoped this helped.
Bob Ross®
Answer:
Nephron-- Collecting Tubule-Collecting Duct- Papillary duct- minor Calyx- Major Calyx- Renal Pelvis- Ureters- Bladder- Urethra
Explanation:
Nephron is a basic unit of kidney,in which urine is formed through the process of filtration (it occurs in glomerulus of the nephron). Nephrons are connected with the collecting duct system of the kidney to a minor calyx. The collecting duct system consists of connecting tubule, medullary collecting duct and papillary duct. The whole collecting duct system has a role in reabsorption and excretion.
Papillary ducts open at minor calyx, later in major calyx. Calyces open in pelvis , which is located inside hilum of kidney. Ureters travel out of kidney through hilum and pour urine into the urinary bladder. Urethra is a tube with the role to tranport the urine from the bladder when the bladder is full.
